No. Nokia 7 Plus does not have the notification light. But it does have the ambient display, so you will always get alert on the display.
Yes, Nokia 7 Plus does have the dual VoLTE support.
Yes, Nokia 7 Plus does have the headphone jack, which is located on the top panel of the phone.
Yes, Nokia 7 Plus does come with 18W fast charger in the box itself.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.